Worked on refining cache management in the nodejs/undici HTTP client, focusing on aligning cache expiration policies with HTTP semantics. Addressed a bug where the deleteAt timestamp was incorrectly applied, ensuring that a one-year expiration is set only for immutable responses while max-age values now scale with the response’s freshness lifetime. Expanded automated test coverage for the determineDeleteAt function, validating cache behavior under various Cache-Control directives such as immutable, max-age, and stale-while-revalidate. Utilized JavaScript for backend development and testing, resulting in a more reliable caching layer that reduces the risk of serving stale content in production environments.